1.

The incorrect order is :

Answer»

Covalent character : `PbCl_(2)gtCaCl_(2)gtSrCl_(2)gtBaCl_(2)`
Thermal stability : `PbF_(4)gtPbCl_(4)gtPbBr_(4)gtPbI_(4)`
Melting point : `KFgtKClgtKBrgtKI`
BOILING point : `CHCl_(3)gtCH_(3)ClgtC Cl_(4)`

Answer :D


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